HD6417034B RENESAS [Renesas Technology Corp], HD6417034B Datasheet - Page 298

• Manufacturer Part Number: HD6417034B
• Description: 32-Bit RISC Microcomputer
• Manufacturer: RENESAS [Renesas Technology Corp]

Section 10 16-Bit Integrated Timer Pulse Unit (ITU)
10.4.5
In reset-synchronized PWM mode, three pairs of complementary positive and negative PWM
waveforms that share a common wave turning point can be obtained using channels 3 and 4. When
set for reset-synchronized PWM mode, the TIOCA3, TIOCB3, TIOCA4, TOCXA4, TIOCB4, and
TOCXB4 pins become PWM output pins and TCNT3 becomes an up-counter. Table 10.12 shows
the PWM output pins used and table 10.13 shows the settings of the registers used.
Table 10.12 Output Pins for Reset-Synchronized PWM Mode
Channel
3
4
Table 10.13 Register Settings for Reset-Synchronized PWM Mode
Procedure for Selecting Reset-Synchronized PWM Mode (figure 10.31):
1. Clear the STR3 bit in TSTR to halt TCNT3. Reset-synchronized PWM mode must be set while
2. Set bits TPSC2-TPSC0 in TCR to select the counter clock source for channel 3. If an external
3. Set bits CCLR1 and CCLR0 in TCR3 to select GRA3 as a counter clear source.
4. Set bits CMD1 and CMD0 in TFCR to select reset-synchronized PWM mode. TIOCA3,
5. Reset TCNT3 (to H'0000). TCNT4 need not be set.
Rev. 7.00 Jan 31, 2006 page 272 of 658
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Register Setting
TCNT3
TCNT4
GRA3
GRB3
GRA4
GRB4
TCNT3 is halted.
clock source is selected, select the external clock edge with bits CKEG1 and CKEG0 in TCR.
TIOCB3, TIOCA4, TIOCB4, TOCXA4, and TOCXB4 become PWM output pins.
Reset-Synchronized PWM Mode
Initial setting of H'0000
Not used (functions independently)
Sets count cycle for TCNT3
Sets the turning point for PWM waveform output by the TIOCA3 and TIOCB3 pins
Sets the turning point for PWM waveform output by the TIOCA4 and TOCXA4 pins
Sets the turning point for PWM waveform output by the TIOCB4 and TOCXB4 pins
Output Pin
TIOCA3
TIOCB3
TIOCA4
TOCXA4
TIOCB4
TOCXB4
Description
PWM output 1
PWM output 1' (negative-phase waveform of PWM output 1)
PWM output 2
PWM output 2' (negative-phase waveform of PWM output 2)
PWM output 3
PWM output 3' (negative-phase waveform of PWM output 3)